Polymer alloy electrolytes for electrochemical devices

Abstract

Solid state polymer alloy electrolytes for electrochemical devices which contain mixtures of polyethylene oxide and polyvinyldienefluoride, or polyethylene oxide and polyvinyldienefluoride/hexafluoropropylene with aprotic solvents and salts, in which solidification occurs by cooling and full or partial evaporation of one solvent, which electrolytes are also useful for construction of electrodes.

I claim: 
     
       1. A composite solid state or semi-solid state polymer alloy electrolyte for batteries, capacitors and other electrochemical devices, wherein the electrolyte mixture contains polyethylene oxide, polyvinyldienefluoride/hexa-fluoropropylene, an alkali metal or alkaline earth metal salt and at least one aprotic liquid. 
     
     
       2. A composite solid state or semi-solid polymer alloy electrolyte for batteries, capacitors and other electrochemical devices wherein the electrolyte contains tetrahydrofuran from a trace amount to the percentage weight of 40%, dimethyl carbonate in the percentage weight range of 0.1% to 90%, ethylene carbonate in the percentage weight range of 0.1% to 60%, lithium triflate in the percentage weight range of 1% to 50%, plyvinyldienefluoride/hexafluoropropylene in the percentage weight range of 0.1% to 70%, and polyethylene oxide in the percentage weight range of 0.5% to 70%. 
     
     
       3. A composite solid state or semi-solid polymer alloy electrolyte for batteries, capacitors and other electrochemical devices wherein the electrolyte contains dimethyl carbonate in the percentage weight range of 0.1% to 90%, ethylene carbonate in the percentage weight range of 0.1% to 60%, lithium perchlorate in the percentage weight range of 1% to 50%, polyvinyldienefluoride/hexafluoropropylene in the percentage weight range of 0.1% to 70%, and polyethylene oxide in the percentage weight range of 0.5% to 70%.